Y8 Audacity Lesson 5

Sound is digitised by: (select 2 that describe this)

• By repeatedly measuring and recording the sound wave

• by recording digital sounds

• Taking readings/samples at points on the sound wave

• Using a microphone

The more accurate and frequent the measurements are.....(choose the BEST answer)

• ....the more data is created and so the larger the file

• ...the longer is takes

• ....The file is smaller

• .....the file is poor quality

The more accurate and frequent the measurements taken when digitizing sound....

• the better the quality of the sound file

• makes no difference

• gives poorer quality sound file

Compression reduces a file's size with no loss of quality.

• Lossless

• Lossy

This file compression results in lost data and quality from the original version. It is typically associated with image files, such as JPEGs, or audio files, like MP3s.

• Lossless

• Lossy

True or False? Compression reduces the size of a file to make it smaller

• True

• False

Lossy or lossless? This type of compression does not get rid of any data

• Lossy

• Lossless

• Both

Lossy or lossless? This type of compression gets rid of some information

• Lossy

• Lossless

• Both

What is compression?

• To convert one file to another
• To reduce the size of data to save space
• To minimize the time taken for a file to be downloaded
• To compress something by pressing it very hard

A .wav file

• Lossless compression, large files

• Lossy compression, smaller files

• Is a graphics file